SAMSUNG SCR_3232E Service Manual

Model:SCR-3232

CONTENTS

CD-ROM

service

manual

n Specifications
n Cautions at Service
n External Part Name
n Disassembly Method
n Exploded Views
n Device Part List
n Packing Options
n Operational Position Diagram
n CD-ROM Block Diagram
n Troubleshooting
n Circuit Diagram

n

Main Components Block Diagram & Pin

Descriptions

n Electrical Parts List

32X

v The design and part of this product is subject to change without prior notice for performance improvement.

Electronics

Code No: BG68-20312A

©

Samsung Electronics Co., Ltd.

JULY, 1998

Printed in Korea

1

n Specifications

1. General Specifications

- Drive type : Computer built-in

- Power consumption : DC + 5V, 1A
DC + 12V, 1.5A

- Dimensions : 149mm(W)X41.5mm(L)X202.6mm(H)

- Net Weight : 950g

2. Electrical Features

- Interface : ATAPI BUS(IDE)

-

Data transfer rate 4800KByte/Sec MAX
(2400KByte/Sec AVG.)

- ACCESS TIME: 1/3 stroke : Below 120msec

full stroke : Below 190msec

- Buffer Capacity : 512Kbyte

- Error ratio : Mode 1: Below 10

-12

Mode 2: Below 10

-9

- Frequency response : 20Hz~20KHz

- Signal to noise ratio : 75dB(1KHz, Lineout)

- Distortion factor : 0.15% Less than(1KHz)

- Channel separation : 65dB(1KHz, Lineout)

- Signal output level :

LINEOUT : 0.7 Vrms(±20%)

H/PHONE:0.6 Vrms(±20%)

- Used laser : Semiconductor laser

2.

Earthing cautions at handling Pick-up

- Because the laser diode in optical Pick-up is subject to get
out of order due to the potential difference occurring by
electricity load charged in clothes or bodies, observe the
following earthing items at handling.

1) Body earthing(hand) : Be sure to wear a wrist strip with
one side earthed.(Impedance : Below 104).
It removes the electricity formed in body.

2) Work table earthing : Put the earthed conductive
plate(Impedance : Below 104) such as copper plate on
work table.

3) Cautions for clothes : Do not have any clothes touch with
Pick-up because the electricity formed in clothes is
destroyed easily.

n Cautions at Service

1. General Items

1) Be careful not to have your eyes or a part of body touch
with laser diode at repair because this product uses laser
diode.

2) Do not disassemble Pick-up at repair. If the laser diode is
bad, replace the entire Pick-up.

3) Keep away from TV or other electrical units at repair to
prevent influence from surrounding units.

4) If you replace the parts during repair, be sure to unplug
the power cable before replacement.

5) If you insert a disc into the drive, be sure to load it

correctly.

6) Because this unit can't be used by itself, surely mount it
on PC (486 DMA support) and check the operations in
use of private device driver floppy diskette. Refer to
Instruction manual.

7) This unit has many parts with features related to safety
and especially, for essential parts, the importance is
indicated on circuit diagram and part list.
Be certain to use the parts with same specifications at
replacing these parts.

1

n Specifications

1. General Specifications

- Drive type : Computer built-in

- Power consumption : DC + 5V, 1A
DC + 12V, 1.5A

- Dimensions : 149mm(W)X41.5mm(L)X202.6mm(H)

- Net Weight : 950g

2. Electrical Features

- Interface : ATAPI BUS(IDE)

-

Data transfer rate 4800KByte/Sec MAX
(2400KByte/Sec AVG.)

- ACCESS TIME: 1/3 stroke : Below 120msec

full stroke : Below 190msec

- Buffer Capacity : 512Kbyte

- Error ratio : Mode 1: Below 10

-12

Mode 2: Below 10

-9

- Frequency response : 20Hz~20KHz

- Signal to noise ratio : 75dB(1KHz, Lineout)

- Distortion factor : 0.15% Less than(1KHz)

- Channel separation : 65dB(1KHz, Lineout)

- Signal output level :

LINEOUT : 0.7 Vrms(±20%)

H/PHONE:0.6 Vrms(±20%)

- Used laser : Semiconductor laser

2.

Earthing cautions at handling Pick-up

- Because the laser diode in optical Pick-up is subject to get
out of order due to the potential difference occurring by
electricity load charged in clothes or bodies, observe the
following earthing items at handling.

1) Body earthing(hand) : Be sure to wear a wrist strip with
one side earthed.(Impedance : Below 104).
It removes the electricity formed in body.

2) Work table earthing : Put the earthed conductive
plate(Impedance : Below 104) such as copper plate on
work table.

3) Cautions for clothes : Do not have any clothes touch with
Pick-up because the electricity formed in clothes is
destroyed easily.

n Cautions at Service

1. General Items

1) Be careful not to have your eyes or a part of body touch
with laser diode at repair because this product uses laser
diode.

2) Do not disassemble Pick-up at repair. If the laser diode is
bad, replace the entire Pick-up.

3) Keep away from TV or other electrical units at repair to
prevent influence from surrounding units.

4) If you replace the parts during repair, be sure to unplug
the power cable before replacement.

5) If you insert a disc into the drive, be sure to load it

correctly.

6) Because this unit can't be used by itself, surely mount it
on PC (486 DMA support) and check the operations in
use of private device driver floppy diskette. Refer to
Instruction manual.

7) This unit has many parts with features related to safety
and especially, for essential parts, the importance is
indicated on circuit diagram and part list.
Be certain to use the parts with same specifications at
replacing these parts.

n External Part Name

1.Front

2.Rear

32X

Earphone jack

Digital output terminal

(Optional)

Sound output terminal Interface terminal

Master/Slave select pin Power terminal

Up/Down Volume

LED Stop/Open button

Play/Search button

Disc tray

2

EmergencyHOLE

nDisassembly Method

1. COVER BOTTOM ASSY disassembly

Remove 4 screws(23) on the bottom of COVER BOTTOM ASSY, lift the back up and disassemble COVER BOTTOM ASSY as
Figure Page 4.

2. COVER-TOP disassembly

After disassembling 4 hooks of FRONT ASSY(2) from COVER TOP(1), pull COVER TOP(1) forward and disassemble it.

3. ASSY DECK+PCB MAIN disassembly

Disassemble FPC PICK-UP(24)and FPC MOTOR(25) connected between assy deck and PCB main, then disassemble between deck
and PCB main.

3

n Operational Position Diagram

789

n Operational Position Diagram

10

7

n Troubleshooting

+5V, +12V of CN700 is normally inputted after

connection of power cable?

X201, X301, X401 oscillate?

Check power short and power supply cable

connection state

After checking IC201 75pin, IC301 11pin,

IC401 88pin for power input, if normal, replace

X201, X301, X401.

IC308 2pin changes from 0V to 5V?

IC302 6pin changes from 0V to 5V?

IC308 3pin : 0V→5V check

Y

Y

N

N

N

N

N

Y

N

N

N

N

N

N

Disc insert

Replace IC308

Check R314, R330, R305 soldering

Check power input of corresponding

IC and replace it

N

Tray in/out? Refer to ‘Tray open/close’

Y

Y

Y

Laser diode on? Refer to ‘No laser diode on’

Y

Focus up/down? Refer to ‘No focus lock’

Y

Focus lock?

Y

Disc rotates? Refer to ‘No disc rotation’

Y

Pause state

v Pause state : LED off as disc rotation state and continue 1 track jump

Y

Spindle lock?

Y

Pick up moves in at power on after moving

out?

Refer to ‘No sled operation’

IC302 3pin changes
from 5V to 0V when

power supplied?

Y

Check and

replace IC302

power

Y

Y

N

Is 3.3V supplied at IC202 4PIN?

IC202 surround circuits

R515, R514 check.

Is 3.3V sanctioned at IC201

DSPVCC terminal?

0V→5V changes at checking IC302 6pin
waveform while opening IC301 64pin and

IC401 9pin in turn

13

Equipments required at repair

1. Oscilloscope(100MHz and more) 2. PROBE for Oscilloscope(10:1)

3. PC(486 and more)

Verify the circuit of power unit and the first status(Plug-in the power cable without I/F cable and verify.)

TE signal at 1 track jump

N